windows-bindgen should support Rust edition 2024

[kennykerr]

There appear to be a bunch of new warnings to deal with...

[kennykerr]

I really don't want to switch the edition - the last edition update was brutal - but hopefully we can find a way to at least test this and future-proof windows-rs for the inevitable. 🙂

[kennykerr]

This is the most vocal warning.

https://doc.rust-lang.org/nightly/edition-guide/rust-2024/unsafe-op-in-unsafe-fn.html

I can probably begin validation against this directly using:

[workspace.lints.rust]
unsafe_op_in_unsafe_fn = "warn"

Also cargo fix --edition helps but is a little over eager.

[kennykerr]

Also, Rust edition 2024 requires Rust 1.85 as the MSRV so we won't be able to actually switch any time soon.

[kennykerr]

Testing locally, #3393 appears to unblock adoption of windows-rs crates and code gen for use with Rust 2024 without any warnings. I'll leave windows-rs itself on edition 2021 for now but I think this issue can be closed with #3393.